Frederic J. Leong, MD
Pediatric Cardiology Physician · Thousand Oaks, CA
Frederic J. Leong, MD is a pediatric cardiology physician with a practice address in Thousand Oaks, California, and NPI 1598876070, issued on Aug 31, 2006. Check the license (California G071490, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Frederic J. Leong
- Credential
- MD
- Primary taxonomy
- Pediatric Cardiology Physician 2080P0202X
- License number
- G071490 CA
Self-reported in NPPES; status is on the state search - Practice location
- 227 W Janss, Thousand Oaks, CA 91360
- Phone
- (805) 497-7214
- Enumerated
- Aug 31, 2006
- Record last updated
- Jul 14, 2023
- Fax
- (805) 497-0864
- Medicaid ID
- 00G714901 CA
- Medicare enrollment
- Enrolled (PECOS I20130911000562); accepts Medicare assignment
- Medical or professional school
- University Of Missouri, Kansas City, School Of Medicine, 1989
- Entity
- Type 1 · individual
8 nearest pediatric cardiology physician records → All 363 in California → Look up another NPI →
Verify Frederic J. Leong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G071490Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- County OF VenturaVentura, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Frederic J. Leong among 363 pediatric cardiology physician records in California
Frederic J. Leong, MD is one of 363 pediatric cardiology physician records with a practice address in California. 59% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 57% newer
- In a Medicare fileYes · 59% of these records are
- In the CMS Doctors and Clinicians fileYes · 45% of these records are
- Graduated1989 · median 2004 among the 164 with a school on file
- Record last updated2023 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2080P0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pediatric Cardiology Physician providers in California
There are 363 pediatric cardiology physician records in California.
All 363 in California → Every provider in Thousand Oaks → Pediatric Cardiology Physician nationwide →
The 8 pediatric cardiology physician records with the nearest ZIP codes
- Timothy Casarez, MDEncino, CA 913161992782148
- David Ferry, M.D.Encino, CA 913161174502793
- Georgios Hartas, M.D.Glendale, CA 912031750598025
- Joseph Ahdoot, MDPasadena, CA 911051841272697
- Lennis Burke, MDPasadena, CA 911051922080779
- Elizabeth Deoliveira, MDPasadena, CA 911051265414833
- John Ho, M.D.Pasadena, CA 911051548478977
- Robert Loitz, MDPasadena, CA 911051225010077
Common questions
What is Frederic J. Leong, MD's NPI number?
Frederic J. Leong, MD's National Provider Identifier (NPI) is 1598876070, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Frederic J. Leong, MD located?
The NPPES record lists a practice address at 227 W Janss, Thousand Oaks, CA, 91360. Phone: (805) 497-7214. Providers update this record themselves, so call before visiting.
How can I verify Frederic J. Leong, MD's license?
NPPES lists California license number G071490, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.